I noticed that starting from Inventory v13 my routers and switches started to warn me (zabbix) about excessive flood of Multicast when scanning.
I flushed out those flooders and only thing I saw was that PDQInventoryScanner.exe did not end its process after success + SSDP Discovery service was enabled thus triggering it to flood.
When I stop SSDP service on "affected" PC, traffic went back to normal. (network management in domain isn't affected by SSDP and its disabled in GPO) but couple new PC-s were out of production OUs and that what I saw.
Do you guys have any idea is this really reason of multicast flood or there is something else too check?